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CONDUCTION
CONVECTION
CORE
CRUST
CYCLE
ELECTROMAGNETIC
MANTLE
MATERIAL
MINERAL
NATURAL
NONRENEWABLE
ORE
PETROLEUM
RADIATION
RECYCLING
RESOURCE
TEMPERATURE
THERMAL
| E | E | B | I | X | N | F | Y | S | A | M | X | J | Z | E |
| D | L | X | G | R | E | S | O | U | R | C | E | E | N | K |
| A | P | E | V | M | A | T | E | R | I | A | L | S | C | Z |
| E | R | O | C | R | U | S | T | D | S | B | O | Z | V | N |
| H | I | D | Y | T | H | E | R | M | A | L | X | Q | Q | Q |
| F | M | C | C | E | R | R | L | W | A | C | C | N | E | N |
| R | L | J | L | M | K | O | E | O | R | N | O | U | Z | O |
| E | A | P | E | P | I | N | M | V | R | I | T | L | A | I |
| V | R | A | X | E | E | N | M | A | T | T | C | L | I | T |
| H | U | M | Y | R | G | B | E | A | G | I | E | I | E | C |
| N | T | I | N | A | E | U | I | R | H | N | Y | P | X | U |
| J | A | O | A | T | L | D | K | S | A | E | E | E | E | D |
| D | N | D | G | U | A | Y | L | G | T | L | J | T | M | N |
| G | G | Z | L | R | E | C | Y | C | L | I | N | G | I | O |
| P | U | P | L | E | N | O | I | T | C | E | V | N | O | C |
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